cas: print URL when retrieving remote signature
cas: print URL when retrieving remote signature

This is for symmetry with printing out the ACI URL; in future we can
standardise this better as we tweak what exactly goes to stdout, but I
think this adds value for now.

jzelinskie/rkt,lucasallan/rkt,s-urbaniak/rkt,maquanyi/rkt,ramitsurana05/rkt,lee212/rkt,wparad/rkt,Shashwatsh/rkt,shobhit85/rkt,euank/rkt,Wilybald/rkt,kinvolk/rkt,Wilybald/rkt,Shashwatsh/rkt,sstabellini/rkt,yifan-gu/rocket,iaguis/rkt,sinfomicien/rkt,shtouff/rkt,rkt/rkt,sgotti/rkt,kbrwn/rkt,clearlinux/rkt,monstermunchkin/rkt,ramitsurana05/rkt,bsmr-go/rkt,mike1729/rkt,crawford/rkt,rhvgoyal/rkt,sinfomicien/rkt,Wilybald/rkt,tixxdz/rkt,fdserr/rkt,lee212/rkt,kinvolk/rkt,ChengTiesheng/rkt,clearlinux/rkt,matthaias/rkt,akshaykarle/rkt,kbrwn/rkt,euank/rkt,bsmr-go/rkt,michelangelo13/rkt,michelangelo13/rkt,jjlakis/rkt,ybubnov/rkt,matthaias/rkt,coreos/rkt,wparad/rkt,mike1729/rkt,mattthias/pkg-rkt,lsm5/rkt,joshix/rkt,sgotti/rkt,markllama/rkt,marineam/rkt,Yhgenomics/rkt,robszumski/rocket,il9ue/rkt,rot26/rkt,tmrts/rkt,lucasallan/rkt,yifan-gu/rkt,iankronquist/rkt,lucasallan/rkt,lsm5/rkt,MattDees/rkt,markllama/rkt,jjlakis/rkt,iaguis/rkt,tmrts/rkt,dalanlan/rkt,intfrr/rkt,il9ue/rkt,blixtra/rkt,jakon89/rkt,tv42/rkt,crawford/rkt,monstermunchkin/rkt,xnox/rkt,liubq919/rkt,iankronquist/rkt,linki/rkt,squaremo/rkt,fdserr/rkt,jjlakis/rkt,ramitsurana05/rkt,blixtra/rkt,MabinGo/rkt,joshix/rkt,kbrwn/rkt,robszumski/rocket,nhlfr/rkt,rkt/rkt,squeed/rkt,intfrr/rkt,coreos/rkt,clearlinux/rkt,luebken/rkt,matthaias/rkt,shtouff/rkt,liugenping/rkt,tv42/rkt,ramitsurana/rkt,klizhentas/rkt,linki/rkt,alexhersh/rkt,joshix/rkt,mjg59/rkt,rhvgoyal/rkt,krnowak/rkt,michelangelo13/rkt,intelsdi-x/rkt,liubq919/rkt,intfrr/rkt,marineam/rkt,sstabellini/rkt,adfernandes/rkt,cab105/rkt,alexhersh/rkt,akshaykarle/rkt,jasonchaffee/rkt,s-urbaniak/rkt,yifan-gu/rocket,akshaykarle/rkt,chrisseto/rkt,lsm5/rkt,smarvin/rkt,ybubnov/rkt,rot26/rkt,xnox/rkt,squeed/rkt,alban/rkt,Yhgenomics/rkt,monstermunchkin/rkt,MattDees/rkt,joshix/rkt,crawford/rkt,rot26/rkt,shobhit85/rkt,alban/rkt,il9ue/rkt,intelsdi-x/rkt,rkt/rkt,adfernandes/rkt,krnowak/rkt,MattDees/rkt,klizhentas/rkt,intelsdi-x/rkt,klizhentas/rkt,squaremo/rkt,sstabellini/rkt,dgonyeo/rkt,cab105/rkt,jasonchaffee/rkt,alban/rkt,jakon89/rkt,wparad/rkt,markllama/rkt,maquanyi/rkt,bsmr-go/rkt,sgotti/rkt,jonboulle/rkt,shobhit85/rkt,s-urbaniak/rkt,iankronquist/rkt,MabinGo/rkt,ybubnov/rkt,mjg59/rkt,alexhersh/rkt,lucasallan/rkt,yifan-gu/rkt,tmrts/rkt,fdserr/rkt,chrisseto/rkt,mjg59/rkt,blixtra/rkt,jzelinskie/rkt,ramitsurana/rkt,mattthias/pkg-rkt,maquanyi/rkt,jonboulle/rkt,smarvin/rkt,endocode/rkt,tixxdz/rkt,adfernandes/rkt,achanda/rkt,eyakubovich/rkt,liubq919/rkt,lee212/rkt,shtouff/rkt,squeed/rkt,eyakubovich/rkt,eyakubovich/rkt,cab105/rkt,luebken/rkt,dalanlan/rkt,kinvolk/rkt,euank/rkt,sinfomicien/rkt,kinvolk/rkt,dgonyeo/rkt,dgonyeo/rkt,dalanlan/rkt,chrisseto/rkt,tixxdz/rkt,squaremo/rkt,achanda/rkt,achanda/rkt,smarvin/rkt,jakon89/rkt,endocode/rkt,Wilybald/rkt,liugenping/rkt,ramitsurana/rkt,xnox/rkt,linki/rkt,coreos/rkt,ChengTiesheng/rkt,jonboulle/rkt,robszumski/rocket,endocode/rkt,jasonchaffee/rkt,MabinGo/rkt,Yhgenomics/rkt,marineam/rkt,nhlfr/rkt,jzelinskie/rkt,Shashwatsh/rkt,tv42/rkt,ChengTiesheng/rkt,iaguis/rkt,rkt/rkt,mattthias/pkg-rkt,luebken/rkt,yifan-gu/rocket,liugenping/rkt,rhvgoyal/rkt,mike1729/rkt,krnowak/rkt,nhlfr/rkt,yifan-gu/rkt